@admon, can you check this? I found it on Reddit 
#!/bin/sh
# Update package list and install macchanger
opkg update
opkg install macchanger
# Create the MAC randomization script
cat << 'EOF' > /etc/init.d/randomize_mac
#!/bin/sh /etc/rc.common
START=99
start() {
for iface in $(ip link show | grep -E '^[0-9]+:' | cut -d ':' -f 2 | cut -d ' ' -f 2); do
if [ "$iface" != "lo" ]; then
macchanger -r $iface
fi
done
}
EOF
# Make the MAC randomization script executable
chmod +x /etc/init.d/randomize_mac
# Enable the MAC randomization script
/etc/init.d/randomize_mac enable
# Delete this script
rm -- "$0"